Dichromats recognize colors using two out of three cone cells; L, M, and S. For example, red-green color blinds can-not distinguish the color between red, yellow, and green. To extend the ability of dichromats to recognize the color dif-ference, we propose a method to expand the color difference when observed by dichromats. We analyze the color between the neighboring pixels in chromaticity space. In addition, we employ multiresolution analysis to form the Pois-son equation. Our multiresolution analysis is non-linear depending on the saturation of each pixel's color. Solving the multiresolution Poisson equation results in the color en-hanced image.